meta-info: Add support for application-defined meta information blocks

Change-Id: If9cdef10728d2c285f3f1021cec57d90d0c04e9b
Refs: #2021

AUTHORS.md

@@ -25,3 +25,4 @@ in the library:
 * Michael Sweatt        <https://www.linkedin.com/in/michaelsweatt>
 * Lixia Zhang           <http://www.cs.ucla.edu/~lixia/home.html>
 * Jeff Burke            <http://remap.ucla.edu/jburke/>
+* Xiaoke Jiang          <http://netarchlab.tsinghua.edu.cn/~shock/>

src/meta-info.cpp

@@ -22,10 +22,15 @@
 #include "meta-info.hpp"
 #include "encoding/block-helpers.hpp"
 #include "encoding/encoding-buffer.hpp"
-#include "util/time.hpp"
+
+#include <boost/concept_check.hpp>
+#include <boost/type_traits.hpp>
 
 namespace ndn {
 
+BOOST_CONCEPT_ASSERT((boost::EqualityComparable<MetaInfo>));
+BOOST_STATIC_ASSERT((boost::is_base_of<tlv::Error, MetaInfo::Error>::value));
+
 MetaInfo::MetaInfo()
   : m_type(TYPE_DEFAULT)
   , m_freshnessPeriod(-1)
@@ -61,6 +66,62 @@ MetaInfo::setFinalBlockId(const name::Component& finalBlockId)
   return *this;
 }
 
+const std::list<Block>&
+MetaInfo::getAppMetaInfo() const
+{
+  return m_appMetaInfo;
+}
+
+MetaInfo&
+MetaInfo::setAppMetaInfo(const std::list<Block>& info)
+{
+  for (std::list<Block>::const_iterator i = info.begin(); i != info.end(); ++i) {
+    if (!(128 <= i->type() && i->type() <= 252))
+      throw Error("AppMetaInfo block has type outside the application range [128, 252]");
+  }
+
+  m_wire.reset();
+  m_appMetaInfo = info;
+  return *this;
+}
+
+MetaInfo&
+MetaInfo::addAppMetaInfo(const Block& block)
+{
+  if (!(128 <= block.type() && block.type() <= 252))
+    throw Error("AppMetaInfo block has type outside the application range [128, 252]");
+
+  m_wire.reset();
+  m_appMetaInfo.push_back(block);
+  return *this;
+}
+
+bool
+MetaInfo::removeAppMetaInfo(uint32_t tlvType)
+{
+  for (std::list<Block>::iterator iter = m_appMetaInfo.begin();
+       iter != m_appMetaInfo.end(); ++iter) {
+    if (iter->type() == tlvType) {
+      m_wire.reset();
+      m_appMetaInfo.erase(iter);
+      return true;
+    }
+  }
+  return false;
+}
+
+const Block*
+MetaInfo::findAppMetaInfo(uint32_t tlvType) const
+{
+  for (std::list<Block>::const_iterator iter = m_appMetaInfo.begin();
+       iter != m_appMetaInfo.end(); ++iter) {
+    if (iter->type() == tlvType) {
+      return &*iter;
+    }
+  }
+  return 0;
+}
+
 template<bool T>
 size_t
 MetaInfo::wireEncode(EncodingImpl<T>& blk) const
@@ -69,9 +130,15 @@ MetaInfo::wireEncode(EncodingImpl<T>& blk) const
   //                ContentType?
   //                FreshnessPeriod?
   //                FinalBlockId?
+  //                AppMetaInfo*
 
   size_t totalLength = 0;
 
+  for (std::list<Block>::const_reverse_iterator appMetaInfoItem = m_appMetaInfo.rbegin();
+       appMetaInfoItem != m_appMetaInfo.rend(); ++appMetaInfoItem) {
+    totalLength += prependBlock(blk, *appMetaInfoItem);
+  }
+
   // FinalBlockId
   if (!m_finalBlockId.empty())
     {
@@ -127,38 +194,48 @@ MetaInfo::wireDecode(const Block& wire)
   // MetaInfo ::= META-INFO-TYPE TLV-LENGTH
   //                ContentType?
   //                FreshnessPeriod?
+  //                FinalBlockId?
+  //                AppMetaInfo*
+
+
+  Block::element_const_iterator val = m_wire.elements_begin();
 
   // ContentType
-  Block::element_const_iterator val = m_wire.find(tlv::ContentType);
-  if (val != m_wire.elements().end())
-    {
-      m_type = readNonNegativeInteger(*val);
-    }
-  else
+  if (val != m_wire.elements_end() && val->type() == tlv::ContentType) {
+    m_type = readNonNegativeInteger(*val);
+    ++val;
+  }
+  else {
     m_type = TYPE_DEFAULT;
+  }
 
   // FreshnessPeriod
-  val = m_wire.find(tlv::FreshnessPeriod);
-  if (val != m_wire.elements().end())
-    {
-      m_freshnessPeriod = time::milliseconds(readNonNegativeInteger(*val));
-    }
-  else
+  if (val != m_wire.elements_end() && val->type() == tlv::FreshnessPeriod) {
+    m_freshnessPeriod = time::milliseconds(readNonNegativeInteger(*val));
+    ++val;
+  }
+  else {
     m_freshnessPeriod = time::milliseconds::min();
+  }
 
   // FinalBlockId
-  val = m_wire.find(tlv::FinalBlockId);
-  if (val != m_wire.elements().end())
-    {
-      m_finalBlockId = val->blockFromValue();
-      if (m_finalBlockId.type() != tlv::NameComponent)
-        {
-          /// @todo May or may not throw exception later...
-          m_finalBlockId.reset();
-        }
-    }
-  else
+  if (val != m_wire.elements_end() && val->type() == tlv::FinalBlockId) {
+    m_finalBlockId = val->blockFromValue();
+    if (m_finalBlockId.type() != tlv::NameComponent)
+      {
+        /// @todo May or may not throw exception later...
+        m_finalBlockId.reset();
+      }
+    ++val;
+  }
+  else {
     m_finalBlockId.reset();
+  }
+
+  // AppMetaInfo (if any)
+  for (; val != m_wire.elements().end(); ++val) {
+    m_appMetaInfo.push_back(*val);
+  }
 }
 
 std::ostream&
@@ -172,10 +249,18 @@ operator<<(std::ostream& os, const MetaInfo& info)
     os << ", FreshnessPeriod: " << info.getFreshnessPeriod();
   }
 
+  // FinalBlockId
   if (!info.getFinalBlockId().empty()) {
     os << ", FinalBlockId: ";
     info.getFinalBlockId().toUri(os);
   }
+
+  // App-defined MetaInfo items
+  for (std::list<Block>::const_iterator iter = info.getAppMetaInfo().begin();
+       iter != info.getAppMetaInfo().end(); ++iter) {
+    os << ", AppMetaInfoTlvType: " << iter->type();
+  }
+
   return os;
 }
 

src/meta-info.hpp

@@ -27,15 +27,45 @@
 #include "encoding/encoding-buffer.hpp"
 #include "util/time.hpp"
 #include "name-component.hpp"
+#include <list>
 
 namespace ndn {
 
 /**
  * An MetaInfo holds the meta info which is signed inside the data packet.
+ *
+ * The class allows experimentation with application-defined meta information blocks,
+ * which slightly violates NDN-TLV specification.  When using the application-defined
+ * meta information blocks be aware that this may result in packet drop (NFD and
+ * previous versions of ndn-cxx will gracefully accept such packet).
+ *
+ * The following definition of MetaInfo block is assumed in this implementation (compared
+ * to the NDN-TLV spec, definition extended to allow optional AppMetaInfo TLV blocks):
+ *
+ *     MetaInfo ::= META-INFO-TYPE TLV-LENGTH
+ *                    ContentType?
+ *                    FreshnessPeriod?
+ *                    FinalBlockId?
+ *                    AppMetaInfo*
+ *
+ *     AppMetaInfo ::= any TLV block with type in the restricted application range [128, 252]
+ *
+ * Note that AppMetaInfo blocks are application-defined and must have TLV type from
+ * the restricted application range [128, 252].
  */
 class MetaInfo
 {
 public:
+  class Error : public tlv::Error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : tlv::Error(what)
+    {
+    }
+  };
+
   enum {
     TYPE_DEFAULT = 0,
     TYPE_LINK = 1,
@@ -81,6 +111,76 @@ public:
   MetaInfo&
   setFinalBlockId(const name::Component& finalBlockId);
 
+  /**
+   * @brief Get all app-defined MetaInfo items
+   *
+   * @note Warning: Experimental API, which may change or disappear in the future
+   *
+   * @note If MetaInfo is decoded from wire and setType, setFreshnessPeriod, or setFinalBlockId
+   *       is called before *AppMetaInfo, all app-defined blocks will be lost
+   */
+  const std::list<Block>&
+  getAppMetaInfo() const;
+
+  /**
+   * @brief Set app-defined MetaInfo items
+   *
+   * This method will replace all existing app-defined MetaInfo items, if they existed.
+   *
+   * @throw Error if some block in @p info has type not in the application range
+   *              (http://named-data.net/doc/ndn-tlv/types.html)
+   *
+   * @note Warning: Experimental API, which may change or disappear in the future
+   *
+   * @note If MetaInfo is decoded from wire and setType, setFreshnessPeriod, or setFinalBlockId
+   *       is called before *AppMetaInfo, all app-defined blocks will be lost
+   */
+  MetaInfo&
+  setAppMetaInfo(const std::list<Block>& info);
+
+  /**
+   * @brief Add an app-defined MetaInfo item
+   *
+   * @throw Error if @p block has type not in the application range
+   *              (http://named-data.net/doc/ndn-tlv/types.html)
+   *
+   * @note Warning: Experimental API, which may change or disappear in the future
+   *
+   * @note If MetaInfo is decoded from wire and setType, setFreshnessPeriod, or setFinalBlockId
+   *       is called before *AppMetaInfo, all app-defined blocks will be lost
+   */
+  MetaInfo&
+  addAppMetaInfo(const Block& block);
+
+  /**
+   * @brief Remove a first app-defined MetaInfo item with type @p tlvType
+   *
+   * @return true if an item was deleted
+   *
+   * @note Warning: Experimental API, which may change or disappear in the future
+   *
+   * @note If MetaInfo is decoded from wire and setType, setFreshnessPeriod, or setFinalBlockId
+   *       is called before *AppMetaInfo, all app-defined blocks will be lost
+   */
+  bool
+  removeAppMetaInfo(uint32_t tlvType);
+
+  /**
+   * @brief Find a first app-defined MetaInfo item of type @p tlvType
+   *
+   * @return NULL if an item is not found, otherwise const pointer to the item
+   *
+   * @throw Error if @p tlvType is not in the application range
+   *              (http://named-data.net/doc/ndn-tlv/types.html)
+   *
+   * @note Warning: Experimental API, which may change or disappear in the future
+   *
+   * @note If MetaInfo is decoded from wire and setType, setFreshnessPeriod, or setFinalBlockId
+   *       is called before *AppMetaInfo, all app-defined blocks will be lost
+   */
+  const Block*
+  findAppMetaInfo(uint32_t tlvType) const;
+
 public: // EqualityComparable concept
   bool
   operator==(const MetaInfo& other) const;
@@ -92,6 +192,7 @@ private:
   uint32_t m_type;
   time::milliseconds m_freshnessPeriod;
   name::Component m_finalBlockId;
+  std::list<Block> m_appMetaInfo;
 
   mutable Block m_wire;
 };

tests/unit-tests/test-data.cpp

@@ -32,7 +32,6 @@ namespace ndn {
 BOOST_AUTO_TEST_SUITE(TestData)
 
 BOOST_CONCEPT_ASSERT((boost::EqualityComparable<Data>));
-BOOST_CONCEPT_ASSERT((boost::EqualityComparable<MetaInfo>));
 BOOST_CONCEPT_ASSERT((boost::EqualityComparable<Signature>));
 
 const uint8_t Content1[] = {0x53, 0x55, 0x43, 0x43, 0x45, 0x53, 0x53, 0x21};
@@ -124,14 +123,6 @@ const unsigned char DEFAULT_PRIVATE_KEY_DER[] = {
   0x0a, 0xb6
 };
 
-const uint8_t MetaInfo1[] = {0x14, 0x04, 0x19, 0x02, 0x27, 0x10};
-const uint8_t MetaInfo2[] = {0x14, 0x14, 0x19, 0x02, 0x27, 0x10, 0x1a, 0x0e, 0x08, 0x0c,
-                             0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x77, 0x6f, 0x72, 0x6c,
-                             0x64, 0x21};
-const uint8_t MetaInfo3[] = {0x14, 0x17, 0x18, 0x01, 0x01, 0x19, 0x02, 0x27, 0x10, 0x1a,
-                             0x0e, 0x08, 0x0c, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x77,
-                             0x6f, 0x72, 0x6c, 0x64, 0x21};
-
 BOOST_AUTO_TEST_CASE(DataEqualityChecks)
 {
   using namespace time;
@@ -179,36 +170,6 @@ BOOST_AUTO_TEST_CASE(DataEqualityChecks)
   BOOST_CHECK_EQUAL(a != b, false);
 }
 
-BOOST_AUTO_TEST_CASE(MetaInfoEqualityChecks)
-{
-  using namespace time;
-
-  MetaInfo a;
-  MetaInfo b;
-  BOOST_CHECK_EQUAL(a == b, true);
-  BOOST_CHECK_EQUAL(a != b, false);
-
-  a.setFreshnessPeriod(seconds(10));
-  BOOST_CHECK_EQUAL(a == b, false);
-  BOOST_CHECK_EQUAL(a != b, true);
-
-  b.setFreshnessPeriod(milliseconds(90000));
-  BOOST_CHECK_EQUAL(a == b, false);
-  BOOST_CHECK_EQUAL(a != b, true);
-
-  b.setFreshnessPeriod(milliseconds(10000));
-  BOOST_CHECK_EQUAL(a == b, true);
-  BOOST_CHECK_EQUAL(a != b, false);
-
-  a.setType(10);
-  BOOST_CHECK_EQUAL(a == b, false);
-  BOOST_CHECK_EQUAL(a != b, true);
-
-  b.setType(10);
-  BOOST_CHECK_EQUAL(a == b, true);
-  BOOST_CHECK_EQUAL(a != b, false);
-}
-
 BOOST_AUTO_TEST_CASE(SignatureEqualityChecks)
 {
   Signature a;
@@ -423,45 +384,6 @@ BOOST_FIXTURE_TEST_CASE(FullName, DataIdentityFixture)
     "%28%BA%D4%B5%27%5B%D3%92%DB%B6p%C7%5C%F0%B6o%13%F7%94+%21%E8%0FU%C0%E8k7GS%A5H");
 }
 
-BOOST_AUTO_TEST_CASE(EncodeMetaInfo)
-{
-  MetaInfo meta;
-  meta.setType(MetaInfo::TYPE_DEFAULT);
-  meta.setFreshnessPeriod(time::seconds(10));
-
-  BOOST_REQUIRE_NO_THROW(meta.wireEncode());
-  BOOST_REQUIRE_EQUAL_COLLECTIONS(MetaInfo1, MetaInfo1+sizeof(MetaInfo1),
-                                  meta.wireEncode().begin(), meta.wireEncode().end());
-
-  meta.setFinalBlockId(name::Component("hello,world!"));
-  BOOST_REQUIRE_NO_THROW(meta.wireEncode());
-  BOOST_REQUIRE_EQUAL_COLLECTIONS(MetaInfo2, MetaInfo2+sizeof(MetaInfo2),
-                                  meta.wireEncode().begin(), meta.wireEncode().end());
-
-  meta.setType(MetaInfo::TYPE_LINK);
-  BOOST_REQUIRE_NO_THROW(meta.wireEncode());
-  BOOST_REQUIRE_EQUAL_COLLECTIONS(MetaInfo3, MetaInfo3+sizeof(MetaInfo3),
-                                  meta.wireEncode().begin(), meta.wireEncode().end());
-}
-
-BOOST_AUTO_TEST_CASE(DecodeMetaInfo)
-{
-  MetaInfo meta(Block(MetaInfo1, sizeof(MetaInfo1)));
-  BOOST_CHECK_EQUAL(meta.getType(), static_cast<uint32_t>(MetaInfo::TYPE_DEFAULT));
-  BOOST_CHECK_EQUAL(meta.getFreshnessPeriod(), time::seconds(10));
-  BOOST_CHECK_EQUAL(meta.getFinalBlockId(), name::Component());
-
-  meta.wireDecode(Block(MetaInfo2, sizeof(MetaInfo2)));
-  BOOST_CHECK_EQUAL(meta.getType(), static_cast<uint32_t>(MetaInfo::TYPE_DEFAULT));
-  BOOST_CHECK_EQUAL(meta.getFreshnessPeriod(), time::seconds(10));
-  BOOST_CHECK_EQUAL(meta.getFinalBlockId(), name::Component("hello,world!"));
-
-  meta.wireDecode(Block(MetaInfo3, sizeof(MetaInfo3)));
-  BOOST_CHECK_EQUAL(meta.getType(), static_cast<uint32_t>(MetaInfo::TYPE_LINK));
-  BOOST_CHECK_EQUAL(meta.getFreshnessPeriod(), time::seconds(10));
-  BOOST_CHECK_EQUAL(meta.getFinalBlockId(), name::Component("hello,world!"));
-}
-
 BOOST_AUTO_TEST_SUITE_END()
 
 } // namespace ndn

tests/unit-tests/test-meta-info.cpp

@@ -0,0 +1,200 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "meta-info.hpp"
+
+#include "data.hpp"
+#include "security/key-chain.hpp"
+#include "security/cryptopp.hpp"
+#include "encoding/buffer-stream.hpp"
+#include "boost-test.hpp"
+
+namespace ndn {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(TestMetaInfo)
+
+const uint8_t MetaInfo1[] = {0x14, 0x04, 0x19, 0x02, 0x27, 0x10};
+const uint8_t MetaInfo2[] = {0x14, 0x14, 0x19, 0x02, 0x27, 0x10, 0x1a, 0x0e, 0x08, 0x0c,
+                             0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x77, 0x6f, 0x72, 0x6c,
+                             0x64, 0x21};
+const uint8_t MetaInfo3[] = {0x14, 0x17, 0x18, 0x01, 0x01, 0x19, 0x02, 0x27, 0x10, 0x1a,
+                             0x0e, 0x08, 0x0c, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x77,
+                             0x6f, 0x72, 0x6c, 0x64, 0x21};
+
+BOOST_AUTO_TEST_CASE(Encode)
+{
+  MetaInfo meta;
+  meta.setType(MetaInfo::TYPE_DEFAULT);
+  meta.setFreshnessPeriod(time::seconds(10));
+
+  BOOST_REQUIRE_NO_THROW(meta.wireEncode());
+  BOOST_REQUIRE_EQUAL_COLLECTIONS(MetaInfo1, MetaInfo1+sizeof(MetaInfo1),
+                                  meta.wireEncode().begin(), meta.wireEncode().end());
+
+  meta.setFinalBlockId(name::Component("hello,world!"));
+  BOOST_REQUIRE_NO_THROW(meta.wireEncode());
+  BOOST_REQUIRE_EQUAL_COLLECTIONS(MetaInfo2, MetaInfo2+sizeof(MetaInfo2),
+                                  meta.wireEncode().begin(), meta.wireEncode().end());
+
+  meta.setType(MetaInfo::TYPE_LINK);
+  BOOST_REQUIRE_NO_THROW(meta.wireEncode());
+  BOOST_REQUIRE_EQUAL_COLLECTIONS(MetaInfo3, MetaInfo3+sizeof(MetaInfo3),
+                                  meta.wireEncode().begin(), meta.wireEncode().end());
+}
+
+BOOST_AUTO_TEST_CASE(Decode)
+{
+  MetaInfo meta(Block(MetaInfo1, sizeof(MetaInfo1)));
+  BOOST_CHECK_EQUAL(meta.getType(), static_cast<uint32_t>(MetaInfo::TYPE_DEFAULT));
+  BOOST_CHECK_EQUAL(meta.getFreshnessPeriod(), time::seconds(10));
+  BOOST_CHECK_EQUAL(meta.getFinalBlockId(), name::Component());
+
+  meta.wireDecode(Block(MetaInfo2, sizeof(MetaInfo2)));
+  BOOST_CHECK_EQUAL(meta.getType(), static_cast<uint32_t>(MetaInfo::TYPE_DEFAULT));
+  BOOST_CHECK_EQUAL(meta.getFreshnessPeriod(), time::seconds(10));
+  BOOST_CHECK_EQUAL(meta.getFinalBlockId(), name::Component("hello,world!"));
+
+  meta.wireDecode(Block(MetaInfo3, sizeof(MetaInfo3)));
+  BOOST_CHECK_EQUAL(meta.getType(), static_cast<uint32_t>(MetaInfo::TYPE_LINK));
+  BOOST_CHECK_EQUAL(meta.getFreshnessPeriod(), time::seconds(10));
+  BOOST_CHECK_EQUAL(meta.getFinalBlockId(), name::Component("hello,world!"));
+}
+
+BOOST_AUTO_TEST_CASE(EqualityChecks)
+{
+  using namespace time;
+
+  MetaInfo a;
+  MetaInfo b;
+  BOOST_CHECK_EQUAL(a == b, true);
+  BOOST_CHECK_EQUAL(a != b, false);
+
+  a.setFreshnessPeriod(seconds(10));
+  BOOST_CHECK_EQUAL(a == b, false);
+  BOOST_CHECK_EQUAL(a != b, true);
+
+  b.setFreshnessPeriod(milliseconds(90000));
+  BOOST_CHECK_EQUAL(a == b, false);
+  BOOST_CHECK_EQUAL(a != b, true);
+
+  b.setFreshnessPeriod(milliseconds(10000));
+  BOOST_CHECK_EQUAL(a == b, true);
+  BOOST_CHECK_EQUAL(a != b, false);
+
+  a.setType(10);
+  BOOST_CHECK_EQUAL(a == b, false);
+  BOOST_CHECK_EQUAL(a != b, true);
+
+  b.setType(10);
+  BOOST_CHECK_EQUAL(a == b, true);
+  BOOST_CHECK_EQUAL(a != b, false);
+}
+
+BOOST_AUTO_TEST_CASE(AppMetaInfo)
+{
+  MetaInfo info1;
+  info1.setType(196);
+  info1.setFreshnessPeriod(time::milliseconds(3600));
+  info1.setFinalBlockId(name::Component("/att/final"));
+
+  uint32_t ints[5] = {128, 129, 130, 131, 132};
+  std::string ss[5] = {"h", "hello", "hello, world", "hello, world, alex",
+                       "hello, world, alex, I am Xiaoke Jiang"};
+
+  for (int i = 0; i < 5; i++) {
+    uint32_t type = 128 + i * 10;
+    info1.addAppMetaInfo(nonNegativeIntegerBlock(type, ints[i]));
+    const std::string& s = ss[i];
+    type += 5;
+    info1.addAppMetaInfo(dataBlock(type, s.c_str(), s.size()));
+  }
+
+  BOOST_CHECK(info1.findAppMetaInfo(252) == 0);
+
+  info1.addAppMetaInfo(nonNegativeIntegerBlock(252, 1000));
+  BOOST_CHECK(info1.findAppMetaInfo(252) != 0);
+
+  info1.addAppMetaInfo(nonNegativeIntegerBlock(252, 1000));
+  BOOST_CHECK(info1.findAppMetaInfo(252) != 0);
+
+  info1.removeAppMetaInfo(252);
+  BOOST_CHECK(info1.findAppMetaInfo(252) != 0);
+
+  info1.removeAppMetaInfo(252);
+  BOOST_CHECK(info1.findAppMetaInfo(252) == 0);
+
+  // // These octets are obtained by the snippet below.
+  // // This check is intended to detect unexpected encoding change in the future.
+  // const Block& wire = info1.wireEncode();
+  // for (Buffer::const_iterator it = wire.begin(); it != wire.end(); ++it) {
+  //   printf("0x%02x, ", *it);
+  // }
+
+  const uint8_t METAINFO[] = {0x14, 0x77, 0x18, 0x01, 0xc4, 0x19, 0x02, 0x0e, 0x10, 0x1a, 0x0c,
+                              0x08, 0x0a, 0x2f, 0x61, 0x74, 0x74, 0x2f, 0x66, 0x69, 0x6e, 0x61,
+                              0x6c, 0x80, 0x01, 0x80, 0x85, 0x01, 0x68, 0x8a, 0x01, 0x81, 0x8f,
+                              0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x94, 0x01, 0x82, 0x99, 0x0c,
+                              0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c,
+                              0x64, 0x9e, 0x01, 0x83, 0xa3, 0x12, 0x68, 0x65, 0x6c, 0x6c, 0x6f,
+                              0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x2c, 0x20, 0x61, 0x6c,
+                              0x65, 0x78, 0xa8, 0x01, 0x84, 0xad, 0x25, 0x68, 0x65, 0x6c, 0x6c,
+                              0x6f, 0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x2c, 0x20, 0x61,
+                              0x6c, 0x65, 0x78, 0x2c, 0x20, 0x49, 0x20, 0x61, 0x6d, 0x20, 0x58,
+                              0x69, 0x61, 0x6f, 0x6b, 0x65, 0x20, 0x4a, 0x69, 0x61, 0x6e, 0x67};
+
+  BOOST_REQUIRE_EQUAL_COLLECTIONS(info1.wireEncode().begin(), info1.wireEncode().end(),
+                                  METAINFO, METAINFO + sizeof(METAINFO));
+
+  MetaInfo info2;
+  info2.wireDecode(Block(METAINFO, sizeof(METAINFO)));
+
+  for (int i = 0; i < 5; i++) {
+    uint32_t tlvType = 128 + i * 10;
+    const Block* block = info2.findAppMetaInfo(tlvType);
+    BOOST_REQUIRE(block != 0);
+    BOOST_CHECK_EQUAL(readNonNegativeInteger(*block), ints[i]);
+    tlvType += 5;
+
+    block = info2.findAppMetaInfo(tlvType);
+    BOOST_REQUIRE(block != 0);
+
+    std::string s3 = std::string(reinterpret_cast<const char*>(block->value()),
+                                 block->value_size());
+    BOOST_CHECK_EQUAL(s3, ss[i]);
+  }
+}
+
+BOOST_AUTO_TEST_CASE(AppMetaInfoTypeRange)
+{
+  MetaInfo info;
+
+  BOOST_CHECK_NO_THROW(info.addAppMetaInfo(nonNegativeIntegerBlock(128, 1000)));
+  BOOST_CHECK_NO_THROW(info.addAppMetaInfo(nonNegativeIntegerBlock(252, 1000)));
+
+  BOOST_CHECK_THROW(info.addAppMetaInfo(nonNegativeIntegerBlock(127, 1000)), MetaInfo::Error);
+  BOOST_CHECK_THROW(info.addAppMetaInfo(nonNegativeIntegerBlock(253, 1000)), MetaInfo::Error);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace tests
+} // namespace ndn